/*
 * *** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * J4Care.
 * Portions created by the Initial Developer are Copyright (C) 2013
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * See @authors listed below
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * *** END LICENSE BLOCK *****
 */

package org.dcm4che3.imageio.codec;

import javax.imageio.spi.ImageReaderWriterSpi;
import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * @author Gunter Zeilinger <gunterze@gmail.com>
 * @since Jul 2015
 */
final class FormatNameFilterIterator<T extends ImageReaderWriterSpi> implements Iterator<T> {
    private final Iterator<T> iter;
    private final String formatName;
    private T next = null;

    FormatNameFilterIterator(Iterator<T> iter, String formatName) {
        this.iter = iter;
        this.formatName = formatName;
        advance();
    }

    private void advance() {
        while (iter.hasNext()) {
            T elt = iter.next();
            if (contains(elt.getFormatNames(), formatName)) {
                next = elt;
                return;
            }
        }

        next = null;
    }

    private static boolean contains(String[] names, String name) {
        for (int i = 0; i < names.length; i++) {
            if (name.equalsIgnoreCase(names[i])) {
                return true;
            }
        }

        return false;
    }

    @Override
    public boolean hasNext() {
        return next != null;
    }

    @Override
    public T next() {
        if (next == null) {
            throw new NoSuchElementException();
        }
        T o = next;
        advance();
        return o;
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException();
    }
}
